Jenelle Evans is happy with the new guy in her life. So why doesn't her mother Barbara feel the same way about Nathan Griffith?

In this exclusive clip from Tuesday (March 11) night's all-new episode of
"Teen Mom 2," Jenelle and Nathan wonder why Barbara is so "suspicious" of him when he's done nothing wrong so far. Jenelle even runs down her roster of exes, comparing Nathan to each one, and suggests that Nathan is just "too good to be true."